CN113802474B - Construction method of half-width bridge and beam-slab stabilizing device of half-width bridge - Google Patents

Abstract

The invention relates to the technical field of bridge repairing construction, and provides a bridge half-width guarantor construction method for half-width guarantor construction operation of a bridge, which aims at bridge surface of which a plurality of beam plates are transversely spliced. Firstly, dismantling one side lane of an old bridge and marking the dismantled lane as a dismantling half width, and keeping the other side lane of the old bridge motionless and marking the lane as a keep-alive half width; then inward extrusion stress is applied from the left side and the right side of the keep-alive half-width bridge deck; then constructing half of the new bridge in the original position of dismantling the half, and canceling the extrusion stress on the bridge deck of the half bridge after the half bridge of the new bridge is in traffic; and finally, dismantling the full-bridge half width of the old bridge, and building the other half width of the new bridge in the original place. The invention also provides a half-width bridge beam slab stabilizing device matched with the applied extrusion stress. The scheme of the invention can maintain the traffic capacity of the road in the whole bridge construction process. And the dangerous situation caused by unstable passing-through part of the old bridge is avoided.

Description

Construction method of half-width bridge and beam-slab stabilizing device of half-width bridge

technical field

The invention relates to the technical field of bridge renovation construction, in particular to a construction method for half-width protection of old bridges and a supporting device for stabilizing half-width bridge girder slabs.

Background technique

Renovation and flipping of bridges on existing roads is different from bridge construction on brand-new roads. In many cases, the original bridges have to maintain a certain traffic capacity during the renovation period. At this time, it is generally carried out to remove one side of the lane, that is, half of it, and then maintain the capacity of the other half to allow all original vehicles to enter the reserved half of the lane for traffic.

However, many old bridges that need to be rebuilt and covered are different from the current integrated box girder bridges. Instead, multiple beams and slabs are spliced horizontally, that is, in the left and right directions to form the bridge deck. Removing half of the bridge deck and concentrating the vehicles on the other half to keep the vehicles unblocked is the half-width construction. The traffic flow becomes larger, which will easily cause a large bending moment on the beam plate of the bridge, or the sudden braking of the vehicle will exert force on the bridge deck. In the case of a large reaction force, the wet joints of the bridge slab are cracked under force, and even the entire beam slab moves in translation. It is difficult to guarantee the safety of Baotong's half-width bridge during construction.

The general solution in the prior art is to use steel plates to directly fix the beam and slab of the Baotong half-width bridge as a whole, and the steel plates are fixed by expansion bolts. However, such steel nails will damage the main structure of the bridge and easily cause irreversible damage to the Baotong half-width bridge. The damage affected the normal opening of half of the pass. The device can only be installed on the bottom surface of the bridge, and it is very difficult to install and construct it, and it is difficult to lift it by personnel, and it is not easy to dismantle the device later.

Contents of the invention

The invention relates to a construction method for bridge half width protection.

The technical problem to be solved is: some old bridges with multiple girders and slabs spliced left and right to form the bridge deck are being renovated, and a certain traffic capacity must be maintained. The joints between the girders and slabs are prone to cracking and even the girders and slabs slip, which affects the safety of the bridge.

In order to solve the above-mentioned technical problems, the construction method of half width of the bridge of the present invention adopts the following scheme.

A bridge half-width protection construction method, which performs half-width protection construction operations on bridges whose bridge decks are horizontally spliced by a plurality of beam slabs, and the bridge half-width protection construction method includes the following steps:

Step 1: Remove one side of the lane of the old bridge and record it as demolition half, keep the other side of the old bridge as it is and record it as the half lane;

Step 2: Apply inward extrusion stress from the left and right sides of Baotong half bridge deck;

Step 3: Construct half of the lanes of the new bridge at the original position where the half was removed;

Step 4: After the half lane of the new bridge is opened to traffic, cancel the extrusion stress applied to the half lane of the old bridge;

Step 5: Remove the traffic protection half of the old bridge, and build the other half lane of the new bridge in its original position.

Preferably, in step 2, a beam-slab stabilizing device is used to load the extrusion stress, and a plurality of beam-slab stabilizing devices are arranged at intervals in the length direction of the beam-slab; the beam-slab stabilizing devices include Two fixed cards on the left and right sides of the bridge deck, the two fixed cards are connected by a tightening mechanism, the tightening mechanism is arranged below the beam plate, and the tightening mechanism tightens the two fixed The card can exert an inward extrusion stress on the half width of the guarantee.

Preferably, in step 2, the half-width bridge deck at the position of the fixing card is trimmed so that the force on the fixing card and the bridge deck is even.

Preferably, in step 1, the dismantling operation of the beam slab of the bridge is carried out gradually from the border side of the dismantling half width to the side of the bridge; Carry out cutting and separation operations, and cut along the joints between the beams.

Preferably, before the cutting and separation of the asphalt pavement described in step 1, the asphalt pavement at both ends of the demolition half width is planed to expose the position of the beam-slab splicing seam; according to the side of the bridge deck and the exposed bridge The joint position of the beam and slab is marked on the asphalt pavement, and then the asphalt pavement is separated by cutting along the line.

Preferably, in step 3, there is a gap between the new bridge and the old bridge road, and the range of the gap is not less than 10cm, which can be determined according to the actual design situation. In order to avoid direct contact between the new bridge and the Baotong half.

Preferably, in Step 5, the bridge piers with half-width protection are removed from top to bottom.

Simultaneously, the present invention also proposes a beam-slab stabilizing device for a half-width bridge specially for reinforcing the half-width bridge of Baotong, and adopts the following scheme.

Half bridge girder slab stabilizing device is used to apply extrusion stress inward to the girder slab of the half-width bridge when the bridge deck is horizontally spliced by multiple beams and slabs for half-width protection construction.

The beam plate stabilizing device includes two fixing cards that can be fixed on the side of the bridge deck, and the two fixing cards are connected by a tightening mechanism,

The two fixing cards are respectively installed on the left and right sides of the half width of the bridge. The tightening mechanism is located under the bridge and the two ends are respectively connected to the fixing cards on both sides of the half width of the bridge. The tightening mechanism can be stretched and contracted to adjust the two The spacing of the fixing cards further applies an inward extrusion stress to the half-width bridge deck.

Preferably, the fixed card is U-shaped, fits with the left and right sides of the half width of the bridge, and the inner edge of the fixed card has a non-slip texture; one side of the fixed card on the adjacent side is stuck in the water hole of the bridge deck, Or by slotting on the bridge guardrail, and one side of the fixing card is stuck in the slot, and a guardrail is installed on the fixing card on the other side.

Preferably, the tightening mechanism is a wire rope with a rope tightener, and the rope tightener is arranged on one side of the bridge, the two ends of the wire rope are fixed on the fixing clips on the side of the bridge, and the other side The bottom of the fixed card is equipped with a pulley, and the wire rope walks around the pulley.

Compared with the prior art, the construction method of bridge half width protection in the present invention has the following beneficial effects:

This kind of bridge with multiple beams and slabs spliced horizontally to form a bridge deck has blocking structures on the left and right sides of the support structure to prevent the outermost beams and slabs from moving outwards, and then the beams and slabs in the middle of the entire bridge deck use the beams and slabs on both sides Constraints are used to keep the position of all beams and slabs on the entire bridge deck fixed. At present, the half-width construction of this kind of bridge will remove the half-width bridge. At this time, the beams and slabs exposed on the outermost side will lose the constraints of the original beams and slabs, and will inevitably move under the condition of large force. .

In the present invention, after the half-width bridge is dismantled, inward compressive stress is applied to the bridge deck of the remaining half-width bridge from the left and right sides. At this time, the beam slab exposed after the half-width bridge is removed will fully squeeze force to avoid movement of the slab.

For the entire construction process, half of the bridge is first demolished, and the rest is generally used as the half-baffle. The half-baffle is reinforced by applying extrusion stress, and vehicles are guided to the half-baffle to maintain a certain traffic capacity of the road. . Then, in order to align with the roads at both ends, the half of Xinqiao Road will be constructed in the original position. After the construction is completed, the half of Xinqiao Road can be opened to traffic, and then the vehicles will be guided to the half of the new bridge that has been constructed. Then remove the force exerted on the retaining half, and remove the retaining half of the old bridge. Construction is underway on the other half of the new bridge. In this way, the basic traffic capacity of the original road is always maintained during the entire bridge construction process. Avoid directly blocking the road and affecting traffic.

Simultaneously, the present invention also proposes a half-width bridge girder slab stabilizing device, which changes the original installation method of crossing the girder slab joints and then fixing the steel plate to the girder slab through expansion bolts. Using the method of connecting two fixed cards that can be stuck on both sides of the bridge deck on the tightening mechanism, only need to connect the two fixed cards to both sides of the half-width protection, and then let the tightening device tighten the two fixed cards. Let all the beams and slabs come together as one. Avoid translation of the outermost exposed beam plate under the action of external forces such as brakes. At the same time, in order to prevent the tightening device from affecting the vehicles on the bridge deck, the tightening device is arranged below the bridge deck. Since the tightening device has no connection with the bridge deck itself, it only needs to use ropes to lift from the left and right sides of the bridge to the lower surface of the bridge slab, and then connect with the fixing clip. Or directly lift the entire beam-slab fixing device from under the bridge, and then install the fixing card on the side of the half-width guarantee, and tighten the tightening device.

The scheme is simple to set up, easy to disassemble and assemble, and avoids the impact on the structure of the bridge caused by the drilling operation on the bridge slab, and also avoids the problem of inconvenient operation on the lower surface of the bridge.

Description of drawings

Fig. 1 is the sectional view after the installation of half-width bridge girder slab stabilizing device of the present invention;

Fig. 2 is a schematic diagram of the fixed card and the rope tightener on the side of Fig. 1;

Fig. 3 is the enlarged view of place A in Fig. 2;

FIG. 4 is a schematic diagram of the position of the fixing card on the other side in FIG. 1 .

Explanation of reference signs: 1-beam plate, 2-fixing card, 3-tightening mechanism, 3a-steel wire rope, 3b-rope tightening device.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In the present invention, in the case of not stating otherwise, the orientation words used generally refer to the upper, lower, left and right shown in accompanying drawing 1 as "up, down, left and right"; "inner and outer "Refers to the inside and outside of the outline of each part itself. The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

In order to solve the renovation construction of some old bridges with multiple beams and slabs spliced into bridge decks, and to maintain a certain traffic capacity, when carrying out half-width protection construction, the half-width bridge beams and slabs 1 of the protection bridge are unstable, and the beams and slabs 1 is easy to crack and even the beam slab 1 slips, which affects the safety of the bridge.

The present invention proposes a bridge half-width protection construction method for bridges whose bridge decks are horizontally spliced by a plurality of girder slabs 1 to carry out half-width protection construction operations, including the following steps:

Step 1: Remove one side of the lane of the old bridge and record it as demolition half, keep the other side of the old bridge as it is and record it as the half lane;

Step 2: Apply inward extrusion stress from the left and right sides of Baotong half bridge deck;

Step 3: Construct half of the new bridge at the original position where the half was removed,

Step 4: After the half-width lane of the new bridge is opened to traffic, cancel the extrusion stress on the half-width bridge deck;

Step 5: Remove the Baotong half of the old bridge and build the other half of the new bridge on the original site.

The demolition of the half-width and the protection of the half-width here are just definitions for the convenience of expression, and it does not mean that in actual construction, one side of the bridge must be demolished or the half-width of the bridge can be determined according to the actual situation. Remove that side first to keep it. Then the side that is removed first is the removal of the half-width, and the other side is the half-width protection. After the demolition of the half-panel, all the vehicles and pedestrians crossing the bridge will be guided to the guaranteed traffic half-panel to maintain the basic traffic capacity of the bridge.

Immediately after the beam slab 1 with the half width removed is removed, compressive stress is applied to both sides of the remaining half width. This extrusion stress can be applied to the side of the beam slab 1 exposed after the removal of the half-width beam slab 1 by jacks or wedges in the direction of the half-width, and then the original blocking on the side of the bridge The structure exerts a reaction force to accomplish the overall goal of applying compressive stress inward from both sides. However, in many cases, the removal of the half-width side does not meet the conditions for installing jacks and other equipment. Just use the same device to clamp both sides of the half-width protection at the same time, and then this device pressurizes inwards, and similarly can also apply extrusion stress to the half-width protection.

Then in step three, in order to reconnect the new bridge with the original road, half of the new bridge is built on the original site where half of the bridge was demolished. New bridge designs should use two halves of independently supported structure.

In Step 4, after the half of the new bridge is connected to the road and opened to traffic, the traffic function of the original half of the old bridge on the road will be transferred to the half of the new bridge that has been opened to traffic. Then the guaranteed and connected half of the old bridge can be removed, and then the construction of the other half of the new bridge can be carried out on the original site of the removed protected and connected half.

Specifically, in step 2, a beam-slab stabilizing device is used to load the extrusion stress, and a plurality of beam-slab stabilizing devices are arranged at intervals along the length direction of the beam-slab 1;

The beam-slab stabilizing device includes two fixing cards 2 that can be respectively fixed on the left and right sides of the half-width bridge deck, and the two fixing cards 2 are connected by a tightening mechanism 3, and the tightening mechanism 3 is arranged on the beam-slab 1 Below, the tightening mechanism 3 tightens the two fixing clips 2 to exert an inward extrusion stress on the half-width of the guarantee. This tightening device can be steel wire rope 3a among the accompanying drawings and the tensioning mechanism of steel wire rope 3a, perhaps can adopt double-ended lead screw or the like as long as the device that can stretch and shrink gets final product.

Preferably, the half-width bridge deck at the position of the fixing card 2 is trimmed so that the fixing card 2 and the bridge deck are evenly stressed. The fixed card 2 is determined according to the specific conditions of the bridge to be installed, and needs to fit with the bridge deck. However, on the bridge surface, there will be concrete residues on the asphalt pavement or the wet joints of the beam-slab 1 joints, which will affect the installation and stress of the fixing clip 2 and the bridge deck.

In the step 1, the dismantling operation of the beam slab 1 of the bridge is carried out gradually from the border side of the demolition half-width to the side of the protection; Cutting and separation operations, and cutting along the joints between the beams 1 . Since the left and right half bridges of the two side lanes of the old bridge are connected as one, the asphalt pavement is also bonded as one. Therefore, in order to avoid affecting the asphalt pavement on the Baotong half width, the asphalt pavement should also be cut from the middle. At the same time, in order to facilitate the removal of the beams and slabs 1, the asphalt pavement is cut along the joints of the beams and slabs 1, so that the beams and slabs 1 are completely separated. Specifically, before the cutting and separation operation in step 1, the asphalt pavement at the two ends of the demolished half width is planed to expose the position of the joint of the beam slab 1; according to the side of the bridge deck and the exposed bridge joint Position, on the asphalt pavement, mark the joint position of the beam plate 1, and then cut and separate the asphalt pavement along the line.

In step 3, a gap is left between the new bridge and the half-width of the old bridge road to avoid direct contact between the new bridge and the half-width of the old bridge road. In this way, the interference and collision between the protection half of the old bridge and the construction half of the new bridge are avoided, which affects the structural safety of the protection half, and at the same time avoids affecting the construction of the new bridge half. In Step 5, the other half of the new bridge is preferably left with a gap with the half constructed in Step 3 in advance, and a separate bridge structure is adopted.

In Step 5, the pier of Baotong half-width is removed from top to bottom to avoid the overturning of the pier.

Among them, in the third step, the pier demolition of half of the bridge needs to be determined according to the actual situation of the old bridge. The pier of the old bridge generally has three forms:

1. An independent pier supports the left and right half bridge decks at the same time. At this time, it is necessary to keep the pier of the old bridge, and only remove the repeated beam slab 1, so that the pier can continue to support half of the bridge. Preferably, after removing half-width beam slab 1, half of the upper surface of the bridge pier will be exposed, and one end of the exposed bridge pier upper surface near the demolished half-width will be removed downward, so as to avoid contact with the beam slab 1 of the new bridge to cover the girder and other positions. The construction interfered with the new bridge.

2. Two independent bridge piers respectively support the left and right half beams and slabs 1. This situation is relatively easy to deal with. It is only necessary to directly remove the half-width supporting piers, and then proceed with the construction of a new bridge. Then the bridge piers with half width will not be treated.

3. The three bridge piers support the beam slabs 1 of the left and right half widths of the left and right bridges. This kind of situation is relatively rare, but the treatment method is to combine the first two methods, remove the outermost pier of the half width, keep the middle piers supporting the left and right half widths at the same time, keep the middle bridge piers and bridge piers that protect the half width, and After removing half of the beam slab 1, the exposed part of the middle pier is also removed downward for a certain distance.

In conjunction with step 2, the present invention applies an inward extrusion stress to the half-width of the bridge deck, and proposes a half-width bridge girder plate stabilizing device, the scheme of which is as follows.

It is used to apply compressive stress inward to the beam plate 1 of the half-width bridge when the bridge deck is horizontally spliced by multiple beam plates 1. The beam plate stabilization device includes a bridge that can be fixed on the bridge Two fixed cards 2 on the side of the face, the two fixed cards 2 are connected by a tightening mechanism 3,

Two fixing cards 2 are respectively installed on the left and right sides of the half width of the bridge. The tightening mechanism 3 is located under the bridge and the two ends are respectively connected to the fixing cards 2 on both sides of the half width of the bridge. The tightening mechanism 3 can be stretched and contracted. In order to adjust the distance between the two fixed clips 2, an inward extrusion stress is applied to the half-width bridge deck.

Simultaneously, the present invention also proposes a half-width bridge girder-slab stabilizing device, which changes the original installation method of crossing the joints of the girder-slab 1 and then fixing the steel plate on the girder-slab 1 through expansion bolts. By connecting two fixing cards 2 that can be stuck on both sides of the bridge deck on the tightening mechanism 3, it is only necessary to connect the two fixing cards 2 to both sides of the half-width protection, and then let the tightening device tighten the two fixed The card 2 can make all the beam plates 1 gather into one. Prevent the outermost exposed beam plate 1 from translating under the action of external forces such as brakes. At the same time, in order to prevent the tightening device from affecting the vehicles on the bridge deck, the tightening device is arranged below the bridge deck. Since the tightening device is not connected to the bridge deck itself, it only needs to be lifted from the left and right sides of the bridge to the lower surface of the bridge plate 1 by ropes, and then connected to the fixed card 2 to get final product. Or directly lift up the entire beam plate 1 fixing device from under the bridge, then install the fixing card 2 on the side of the half-width guarantee, and tighten the tightening device.

Specifically, the fixed card 2 can be stuck on the bridge deck or the side of the beam slab 1, and then when an inward external force is applied to the fixing, the fixed card 2 can transmit the external force to the beam slab 1 of the bridge. Do not stick to a specific form of expression. The external force of the fixed card 2 is exerted by the tightening mechanism 3, and the tightening mechanism 3 exerts an active force toward the inner side of the bridge to the two fixed cards 2 at the same time during the contraction movement. The tightening mechanism 3 is a mechanism capable of contraction and relaxation while applying and maintaining tension during contraction. It can be a leading screw or a hydraulic mechanism, but the leading screw or hydraulic pressure are relatively heavy and have high cost, which is not an application occasion of the present invention. Therefore preferably adopt the steel wire rope 3a that has rope tightener 3b among the present invention, and rope tightener 3b can make steel rope 3a shrink or elongate, and steel rope 3a directly applies pulling force to two fixed clips 2, and rope tightener 3b is directly installed on the wire rope 3a can be a hand-operated wire take-up as shown in Figure 2, and then fix it with a ratchet to maintain the tension, or it can be any kind of wire rope 3a tensioner 3b, which only needs to be able to tighten the wire rope 3a and fix it. Can. Preferably, for the convenience of operation, the rope tightener 3b is arranged on one side of the bridge, and further preferably, the two ends of the wire rope 3a are fixed on the fixed card 2 on the side of the bridge, and the fixed card 2 on the other side is A pulley is installed at the bottom of the bottom, and the wire rope 3a walks around the pulley. Alternatively, as shown in FIG. 2 , one or more steel wires can be used, and the two ends of the steel wire rope 3 a are directly connected to the two fixing clips 2 . Preferably, the rope tightener 3b can also be fixed on the fixed card 2 according to the type of the selected rope tightener 3b, and then one end of the wire rope 3a is connected to the rope tightener 3b, and the other end is connected to another fixed card 2.

The fixed card 2 is U-shaped, and fits with the left and right sides of the half width of the bridge, and the inner edge of the fixed card 2 has a non-slip texture; the anti-slip texture prevents the fixed card 2 from falling off. One side of the fixed card 2 on the adjacent side is stuck in the water hole of the bridge deck, or one side of the fixed card 2 is stuck in the slot on the bridge guardrail, or in the guardrail of the bridge itself as shown in Figure 2 In a relatively strong situation, the fixed clip 2 on the side of the edge can also be directly fixed on the guardrail. The other side is relatively simple, as shown in FIG. 3 , it can be directly clamped on the exposed beam plate 1 .

As shown in FIG. 2 , the fixing card 2 is provided with a mounting base, and the mounting base serves as the installation base of the guardrail. The guardrail also provides security for the exposed side of the bridge.

Because the wire rope 3a will inevitably be bent on the beam slab 1, the steel wire rope 3a is padded with a backing plate at the fold line on the beam slab 1 to disperse the pressure of the steel wire rope on the beam slab.

The fixed card 2 is U-shaped, including an upper plate, a lower plate and side plates, and the upper and lower ends of the side plates are respectively connected to the sides of the upper plate and the lower plate; the material of the fixed card 2 is metal.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (6)

1. The bridge half-width guarantor construction method aims at bridge construction operation of bridge with bridge deck transversely spliced by a plurality of beam plates (1), and comprises the following steps:

step one: dismantling one side lane of the old bridge and marking as a dismantling half width, and keeping the other side lane of the old bridge motionless and marking as a keep-alive half width;

step two: applying inward extrusion stress from the left side and the right side of the keep-through half-width bridge deck;

step three: constructing a half-width lane of the new bridge in the half-width dismantling original position;

step four: after a half-width lane of the new bridge is used, removing extrusion stress applied to the keep-through half-width of the old bridge;

step five: dismantling the remaining half width of the old bridge and building the other half width lane of the new bridge in situ;

loading extrusion stress by adopting a beam plate stabilizing device in the second step, and arranging a plurality of beam plate stabilizing devices at intervals in the length direction of the beam plate (1); the beam plate stabilizing device comprises two fixing clamps (2) which can be respectively fixed on the left side and the right side of a bridge floor with a half width, the two fixing clamps (2) are connected through a tightening mechanism (3), the tightening mechanism (3) is arranged below the beam plate (1), and the tightening mechanism (3) tightens the two fixing clamps (2) to apply inward extrusion stress to the half width.

2. The bridge half-width bridge girder-retaining construction method according to claim 1, wherein in the second step, the bridge deck of the girder-retaining half-width at the position of the fixing clip (2) is trimmed so that the stress of the fixing clip (2) and the bridge deck is uniform.

3. The bridge half-width guarantor construction method according to claim 1, characterized in that in step one, the dismantling operation of the bridge beam plate (1) is performed from the side of the side edge of the dismantling half-width to the guarantor side in sequence;

before the dismantling operation of the beam plates (1), the asphalt pavement of the half bridge deck is dismantled for cutting and separating operation, and the cutting is carried out along the splicing seams between the beam plates (1).

4. The bridge half-width pass-protection construction method according to claim 3, wherein before the cutting and separating operation of the asphalt pavement in the first step, the asphalt pavement at the two ends of the half-width is removed and the positions of the splice seams of the beam plates (1) are exposed; and scribing the splicing seam position of the beam slab (1) on the asphalt pavement according to the side edges of the bridge deck and the exposed splicing seam position of the bridge, and then cutting and separating the asphalt pavement along the scribing.

5. The bridge half-width bridge traffic-preserving construction method according to claim 1, wherein in the third step, a gap is left between the traffic-preserving half-width of the new bridge and the traffic-preserving half-width of the old bridge so as to avoid direct contact between the new bridge and the traffic-preserving half-width.

6. The bridge half-width bridge girder construction method according to claim 1, wherein in the fifth step, bridge piers of the girder are dismantled from top to bottom.

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